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4. Circuit Description
4.2.5.1 Voice Band Interface
The audio front-end essentially consists of voice and audio data paths. Figure 1 shows the block
diagram of the audio front-end. The entire voice band data paths comply with the GSM 03.50
specification. In addition, Mono hands-free audio or external FM radio playback path are provided. The
audio stereo audio path facilitates audio quality playback, external FM radio, and voice playback
through headset.
Figure 2 shows the digital circuits block diagram of the audio front-end. The APB register block is an
APB peripheral that stores settings from the MCU. The DSP audio port block interfaces with the DSP
for control and data communications.
The digital filter block performs filter operations for voice band and audio band signal processing. The
Digital Audio Interface (DAI) block communicates with the System Simulator for FTA or external
Bluetooth modules.
LGE Internal Use Only
Figure 1 Block diagram of audio front-end
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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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